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The heater runs out of hot air quickly on your 2003 grand am gt?
Wiki User
∙ 16y ago
It sounds like the coolant is low or there is an air pocket in the coolant system. If it heats for a short time and then stops, the heater core must be out of warm coolant and only air is left in it which will not give off any heat through the core. Another cause could be the doors on the heater system. I think they are vacuum operated on these cars but I'm not sure. A big change in the vacuum due to an occasional leak could cause this. Both reasons above assume the the heaterr fan is working properly also.
Wiki User
∙ 16y ago
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